import { describe, it, expect, vi, beforeEach } from 'vitest';
import FileListManager from '../utils/renderer/FileListManager';

describe('FileListManager', () => {
  let fileListEl;
  let flm;
  let folderClickSpy;

  beforeEach(() => {
    fileListEl = document.createElement('div');
    fileListEl.id = 'file-list';
    folderClickSpy = vi.fn();
    flm = new FileListManager(fileListEl, folderClickSpy);
  });

  describe('constructor', () => {
    it('initializes with null draggedItem', () => {
      expect(flm.draggedItem).toBeNull();
    });

    it('accepts null folder click callback', () => {
      const manager = new FileListManager(fileListEl, null);
      expect(manager.onFolderClick).toBeNull();
    });
  });

  describe('displayFiles', () => {
    it('shows empty message when no files', () => {
      flm.displayFiles([]);
      expect(fileListEl.textContent).toContain('No media files found');
    });

    it('displays folders and media files', () => {
      const files = [
        { isFolder: true, path: '/path/folder', name: 'Extras' },
        { isFolder: false, path: '/path/file.mp4', name: 'episode.mp4', duration: '45:00', quality: '1080p', fps: '30fps' },
      ];
      flm.displayFiles(files);
      const items = fileListEl.querySelectorAll('.file-item');
      expect(items.length).toBe(2);
      expect(items[0].classList.contains('folder-item')).toBe(true);
    });

    it('sorts folders before files', () => {
      const files = [
        { isFolder: false, path: '/path/file.mp4', name: 'episode.mp4', duration: '45:00' },
        { isFolder: true, path: '/path/folder', name: 'Extras' },
      ];
      flm.displayFiles(files);
      const items = fileListEl.querySelectorAll('.file-item');
      expect(items[0].classList.contains('folder-item')).toBe(true);
    });

    it('creates folder element with click handler', () => {
      const files = [{ isFolder: true, path: '/path/folder', name: 'Extras' }];
      flm.displayFiles(files);
      const folderItem = fileListEl.querySelector('.folder-item');
      expect(folderItem).not.toBeNull();
    });

    it('creates media file with episode number', () => {
      const files = [
        { isFolder: false, path: '/path/file.mp4', name: 'episode.mp4', duration: '45:00', quality: '1080p', fps: '30fps' },
      ];
      flm.displayFiles(files);
      const episodeEl = fileListEl.querySelector('.episode-number');
      expect(episodeEl).not.toBeNull();
      expect(episodeEl.textContent).toBe('1');
    });

    it('marks problematic files with warning icon', () => {
      const files = [
        { isFolder: false, path: '/path/bad.mp4', name: 'bad.mp4', duration: '00:00', isProblematic: true },
      ];
      flm.displayFiles(files);
      const warnLabel = fileListEl.querySelector('.problematic-label');
      expect(warnLabel).not.toBeNull();
    });
  });

  describe('updateEpisodeNumbers', () => {
    it('updates episode numbers sequentially', () => {
      const files = [
        { isFolder: false, path: '/path/f1.mp4', name: 'f1.mp4' },
        { isFolder: false, path: '/path/f2.mp4', name: 'f2.mp4' },
        { isFolder: false, path: '/path/f3.mp4', name: 'f3.mp4' },
      ];
      flm.displayFiles(files);
      flm.updateEpisodeNumbers();
      const episodeEls = fileListEl.querySelectorAll('.episode-number');
      expect(episodeEls[0].textContent).toBe('1');
      expect(episodeEls[1].textContent).toBe('2');
      expect(episodeEls[2].textContent).toBe('3');
    });
  });

  describe('clear', () => {
    it('clears the file list', () => {
      const files = [
        { isFolder: false, path: '/path/f1.mp4', name: 'f1.mp4' },
      ];
      flm.displayFiles(files);
      flm.clear();
      expect(fileListEl.innerHTML).toBe('');
    });
  });

  describe('getMediaFileItems', () => {
    it('returns only media file items', () => {
      const files = [
        { isFolder: true, path: '/path/folder', name: 'Folder' },
        { isFolder: false, path: '/path/file.mp4', name: 'file.mp4' },
      ];
      flm.displayFiles(files);
      const mediaItems = flm.getMediaFileItems();
      expect(mediaItems.length).toBe(1);
    });
  });

  describe('getFolderItems', () => {
    it('returns only folder items', () => {
      const files = [
        { isFolder: true, path: '/path/folder', name: 'Folder' },
        { isFolder: false, path: '/path/file.mp4', name: 'file.mp4' },
      ];
      flm.displayFiles(files);
      const folderItems = flm.getFolderItems();
      expect(folderItems.length).toBe(1);
    });
  });

  describe('highlightFilesMatchingEpisode', () => {
    it('highlights matching episodes', () => {
      const files = [
        { isFolder: false, path: '/path/f1.mp4', name: 'f1.mp4' },
        { isFolder: false, path: '/path/f2.mp4', name: 'f2.mp4' },
        { isFolder: false, path: '/path/f3.mp4', name: 'f3.mp4' },
      ];
      flm.displayFiles(files);
      flm.highlightFilesMatchingEpisode(2, 2);
      const items = flm.getMediaFileItems();
      expect(items[0].classList.contains('hovered-file')).toBe(false);
      expect(items[1].classList.contains('hovered-file')).toBe(true);
      expect(items[2].classList.contains('hovered-file')).toBe(false);
    });

    it('highlights overlapping ranges', () => {
      const files = [
        { isFolder: false, path: '/path/f1.mp4', name: 'f1.mp4' },
        { isFolder: false, path: '/path/f2.mp4', name: 'f2.mp4' },
      ];
      flm.displayFiles(files);
      // Update first file to have range 1-2
      const firstEp = flm.getMediaFileItems()[0].querySelector('.episode-number');
      firstEp.dataset.episodeEnd = '2';

      flm.highlightFilesMatchingEpisode(1, 1);
      const items = flm.getMediaFileItems();
      // File 1 (range 1-2) overlaps with hover range 1-1
      expect(items[0].classList.contains('hovered-file')).toBe(true);
      // File 2 (range 2-2) does NOT overlap with hover range 1-1
      expect(items[1].classList.contains('hovered-file')).toBe(false);
    });
  });

  describe('removeFileHighlights', () => {
    it('removes all highlights', () => {
      const files = [
        { isFolder: false, path: '/path/f1.mp4', name: 'f1.mp4' },
      ];
      flm.displayFiles(files);
      flm.highlightFilesMatchingEpisode(1, 1);
      flm.removeFileHighlights();
      const items = flm.getMediaFileItems();
      expect(items[0].classList.contains('hovered-file')).toBe(false);
    });
  });

  describe('setFolderClickCallback', () => {
    it('updates the callback', () => {
      const newCallback = vi.fn();
      flm.setFolderClickCallback(newCallback);
      expect(flm.onFolderClick).toBe(newCallback);
    });
  });

  describe('folder click handling', () => {
    it('calls folder click callback when folder is clicked', () => {
      const files = [{ isFolder: true, path: '/path/folder', name: 'Extras' }];
      flm.displayFiles(files);
      const folderItem = fileListEl.querySelector('.folder-item');
      folderItem.click();
      expect(folderClickSpy).toHaveBeenCalledWith('/path/folder', 'Extras');
    });
  });
});